EETC Conduit & Raceway Systems

Question 1

According to NEC Chapter 9, Table 1, what is the maximum percentage of conduit cross-sectional area that conductors may occupy when three or more conductors are installed?

Accepted Answer

40%

Answer

NEC Chapter 9, Table 1 limits conduit fill to 40% of the cross-sectional area when three or more conductors are installed to allow for heat dissipation and future wire pulling.

Question 2

Which conduit type has the thinnest wall and is NOT suitable for direct burial in soil without additional protection?

Accepted Answer

Electrical Metallic Tubing (EMT)

Answer

EMT has the thinnest wall of the metallic conduit types and is not listed for direct burial in soil; it is intended for surface or concealed installations in protected locations.

Question 3

What is the maximum total degrees of bends permitted in a single conduit run between pull points according to the NEC?

Accepted Answer

360°

Answer

The NEC limits the total bends between pull points to 360° (equivalent to four 90° bends) to ensure conductors can be pulled without excessive damage.

Question 4

Liquidtight Flexible Metal Conduit (LFMC) is most commonly specified for:

Accepted Answer

Final connections to motors and other vibrating equipment

Answer

LFMC is designed to provide a flexible, liquidtight connection ideal for motor terminations and equipment subject to vibration, movement, or exposure to liquids.

Question 5

Which type of conduit is specifically listed and approved for direct burial in soil and concrete encasement?

Accepted Answer

Rigid PVC Conduit (Schedule 40)

Answer

Rigid PVC conduit (Schedule 40 and Schedule 80) is listed for direct burial in soil and concrete encasement, making it a common choice for underground runs.

(EETC) Electrical Technician Certification Practice Test

(EETC) Electrical Technician Certification Practice Test

EETC Conduit & Raceway Systems